87 lines
2.6 KiB
Plaintext
87 lines
2.6 KiB
Plaintext
.\" Copyright (c) 1994, 1996, 1997
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that: (1) source code distributions
|
|
.\" retain the above copyright notice and this paragraph in its entirety, (2)
|
|
.\" distributions including binary code include the above copyright notice and
|
|
.\" this paragraph in its entirety in the documentation or other materials
|
|
.\" provided with the distribution, and (3) all advertising materials mentioning
|
|
.\" features or use of this software display the following acknowledgement:
|
|
.\" ``This product includes software developed by the University of California,
|
|
.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
|
|
.\" the University nor the names of its contributors may be used to endorse
|
|
.\" or promote products derived from this software without specific prior
|
|
.\" written permission.
|
|
.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
|
|
.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
|
|
.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
.\"
|
|
.TH PCAP_LOOKUPDEV 3PCAP "8 September 2017"
|
|
.SH NAME
|
|
pcap_lookupdev \- find the default device on which to capture
|
|
.SH SYNOPSIS
|
|
.nf
|
|
.ft B
|
|
#include <pcap/pcap.h>
|
|
.ft
|
|
.LP
|
|
.nf
|
|
.ft B
|
|
char errbuf[PCAP_ERRBUF_SIZE];
|
|
.ft
|
|
.LP
|
|
.ft B
|
|
[DEPRECATED] char *pcap_lookupdev(char *errbuf);
|
|
.ft
|
|
.fi
|
|
.SH DESCRIPTION
|
|
.B This interface is obsoleted by
|
|
.BR pcap_findalldevs (3PCAP).
|
|
To find a default device on which to capture, call
|
|
.BR pcap_findalldevs ()
|
|
and, if the list it returns is not empty, use the first device in the
|
|
list. (If the list is empty, there are no devices on which capture is
|
|
possible.)
|
|
.LP
|
|
.B If
|
|
.BR pcap_init (3PCAP)
|
|
.B has been called, this interface always returns
|
|
.BR NULL .
|
|
.LP
|
|
.BR pcap_lookupdev ()
|
|
returns a pointer to a string giving the name of a network device
|
|
suitable for use with
|
|
.BR pcap_create (3PCAP)
|
|
and
|
|
.BR \%pcap_activate (3PCAP),
|
|
or with
|
|
.BR pcap_open_live (3PCAP),
|
|
and with
|
|
.BR pcap_lookupnet (3PCAP).
|
|
If there is an error,
|
|
or if
|
|
.BR pcap_init (3PCAP)
|
|
has been called,
|
|
.B NULL
|
|
is returned and
|
|
.I errbuf
|
|
is filled in with an appropriate error message.
|
|
.I errbuf
|
|
is assumed to be able to hold at least
|
|
.B PCAP_ERRBUF_SIZE
|
|
chars.
|
|
.SH SEE ALSO
|
|
.BR pcap (3PCAP)
|
|
.SH BUGS
|
|
The pointer returned by
|
|
.BR pcap_lookupdev ()
|
|
points to a static buffer; subsequent calls to
|
|
.BR pcap_lookupdev ()
|
|
in the same thread, or calls to
|
|
.BR pcap_lookupdev ()
|
|
in another thread, may overwrite that buffer.
|
|
.LP
|
|
In WinPcap and Npcap, this function may return a UTF-16 string rather
|
|
than an ASCII or UTF-8 string.
|